fix(HEL-494): 切断网站生产装配外源直连，iFinD 与实时观察改走中枢

生产 gateway 不再实例化 iFinD、东财图和免费实时聚合器；问财与竞价快照作为中枢内部数据源。全站阻断外源测试覆盖日K、报价、图表、问财和竞价快照。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

xiaobai-datahub/datahub/settings.py

@@ -26,6 +26,8 @@ class Settings:
     api_token: str = ""
     admin_password: str = ""
     tushare_token: str = ""
+    ifind_refresh_token: str = ""
+    ifind_access_token: str = ""
     db_path: Path = DEFAULT_DB_PATH
     backup_dir: Path = DEFAULT_BACKUP_DIR
     quality: dict[str, Any] = field(default_factory=dict)
@@ -113,6 +115,8 @@ def load_settings(
         api_token=str(environ.get("DATAHUB_TOKEN") or "").strip(),
         admin_password=str(environ.get("DATAHUB_ADMIN_PASSWORD") or "").strip(),
         tushare_token=str(environ.get("TUSHARE_TOKEN") or "").strip(),
+        ifind_refresh_token=str(environ.get("IFIND_REFRESH_TOKEN") or "").strip(),
+        ifind_access_token=str(environ.get("IFIND_ACCESS_TOKEN") or "").strip(),
         db_path=db_path,
         backup_dir=backup_dir,
         quality=_load_quality(quality_path),